I "definitely know" what the last letter is and I am pretty sure that I know the answer but I cannot work out why it is what I am sure it is. The answer I have in mind is a word relating to the sun in a classical language. I can parse the last 2 letters, not the first 4. Help please.
Your answer HELIOS is correct, because it's SOIL EH reversed (earth,what?!):you only divided the word up wrongly!
Remember in future to give the clue: by chance I still had the puzzle here, but often we can't help you otherwise!